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Remarks on the Critical Behavior of Second Order Additive Invariants in Elementary Cellular Automata

Fukś H.

Fundamenta Informaticae

2007

Vol. 78, nr 3

329-341

We present results of some numerical investigations of second order additive invariants in elementary cellular automata rules. Fundamental diagrams of rules which possess additive invariants are either linear or exhibit singularities similar to singularities of rules with first-order invariant. Only rules which have exactly one invariants exhibit singularities. At the singularity, the current decays to its equilibrium value as a power law ta, and the value of the exponent a obtained from numerical simulations is very close to -1/2. This is in agreements with values previously reported for number-conserving rules, and leads to a conjecture that regardless of the order of the invariant, exponent a has a universal value of 1/2.